System for limiting overvoltage in ultrahigh-voltage alternating current power transmission system
A UHV AC and power transmission system technology, applied in the field of high voltage power transmission, can solve the problems of reduced reliability and unsatisfactory effects, and achieve the effects of reducing insulation requirements, simple structure and prolonging service life
Inactive Publication Date: 2011-05-25
TSINGHUA UNIV
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Problems solved by technology
[0004] The applicant once proposed to use multiple groups of surge arresters along the line to limit the operating overvoltage of the UHV system, but the arresters used are ordinary arresters, and the effect of limiting the overvoltage is not ideal.
At the same time, the closing resistor is used in the circuit breaker of the substation, which reduces the reliability of the whole system
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Embodiment Construction
[0017] The system for limiting the overvoltage in the UHV AC transmission system proposed by the present invention has a structure such as figure 2 shown, including:
[0018] The first substation 1 and the second substation 3 are used to increase or decrease the voltage in the high-voltage AC power transmission system and control the energy transmission in the high-voltage AC power transmission system. The first substation and the second substation respectively include multiple Transformer T 1 ~T 2 and T 1 '~T 2 ′、Multiple sets of surge arresters A 1 ~A 3 and A 1 '~A 3 ’, and multiple circuit breakers B 1 ~B 3 and B 1 '~B 3 ’, multiple transformers are connected to the high-voltage AC transmission system through multiple circuit breakers, and multiple lightning arresters are connected in parallel to multiple corresponding transformers and the busbar of the substation;
[0019] The transmission line 2 is used for long-distance transmission of electric energy, and t...
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The invention relates to a system for limiting overvoltage in an ultrahigh-voltage alternating current power transmission system, and belongs to the technical field of high-voltage power transmission. The system comprises a first transformer station, a second transformer station and a power transmission line, wherein the first transformer station and the second transformer station are used for raising or reducing the voltage in the high-voltage alternating current power transmission system and controlling energy transmission in the high-voltage alternating current power transmission system; and the power transmission line is used for remotely transmitting electrical energy, the power transmission line is provided with a plurality of groups of lightning arresters, and the lightning arresters are low residual voltage lightning arrester with excellent volt-ampere characteristics. The system better protects the equipment in the transformer stations and reduces the insulating requirement for the equipment at the same time of reducing the conventional overvoltage level so as to reduce the manufacturing cost and the manufacturing difficulty of the equipment; and the use of a closing resistor in a circuit breaker can be canceled, so that the service life of the equipment is prolonged, and the work reliability of the system is improved.
Description
technical field [0001] The invention relates to a system for limiting overvoltage in an ultra-high voltage AC power transmission system, which belongs to the technical field of high voltage power transmission. Background technique [0002] Overvoltage and its protection are one of the key issues in power systems, especially for UHV AC transmission systems. [0003] At present, the important factor restricting the development of UHV AC transmission and transformation technology in my country is the high level of operating overvoltage and lightning overvoltage. Since the overvoltage level of the system plays a decisive role in the selection and manufacture of UHV equipment, too high Overvoltage levels will lead to technical bottlenecks and high costs in the development of UHV equipment. For the operating overvoltage of the UHV system, the circuit breaker is currently equipped with a closing resistor and a zinc oxide arrester to limit it, such as figure 1 shown. Among them, t...
Claims
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Inventor 何金良胡军李辰曾嵘
Owner TSINGHUA UNIV